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A mineral cannot be scratched by a finger nailbut can be scratched by a penny. What is the approximate hardness of this mineral?

A mineral cannot be scratched by a finger nailbut can be scratched by a penny. What is the approximate hardness of this mineral?
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A mineral cannot be scratched by a finger nailbut can be scratched by a penny. What is the approximate hardness of this mineral?

User Hishaam Namooya
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somewhere between 2.5 and 3.5

User Heltonbiker
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